第三系泥岩工程特性与仰拱施工技术研究  

Study on Engineering Characteristics of Tertiary Mudstone and Construction Technology of Inverted Arch

作　　者：张献伟 洪开荣 常翔 陈鸿 ZHANG Xianwei;HONG Kairong;CHANG Xiang;CHEN Hong(Erchu Co.,Ltd.of China Railway Tunnel Group,Langfang 065201;China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458)

机构地区：[1]中铁隧道集团二处有限公司,廊坊065201 [2]中铁隧道局集团有限公司,广州511458

出　　处：《现代隧道技术》2021年第2期214-219,共6页Modern Tunnelling Technology

摘　　要：针对隧道仰拱施工期间地下水汇聚和开挖扰动造成第三系泥岩软化强度降低的问题,通过现场取样进行室内试验,研究结果表明,第三系泥岩在自然状态下的单轴抗压强度和含水率呈反相关关系,饱和状态下的单轴抗压强度明显降低,软化效果明显,软化后地基承载力不能满足设计要求。施工中对不同路径的水流实行分类归集以降低水对围岩的劣化影响,基底回填碎石注浆加固措施解决了仰拱开挖后渗水通道和围岩扰动软化问题,后期注浆加固后也有效解决了地基承载力不足的问题。富水地段增设独立纵横向排水系统使仰拱基底积水在达到压力条件下能够及时排出,避免了运营后由于地下水的影响导致基岩软化可能造成的基底病害。该技术在浩吉铁路中条山隧道得到了较好的应用效果。To solve the problem of softening and strength decrease of tertiary mudstone due to groundwater conver⁃gence and excavation disturbance during the inverted arch construction of a tunnel,the laboratory test is carried out by field sampling.The results show that the uniaxial compressive strength of the tertiary mudstone in the natural state is negative correlated with the water content,the uniaxial compressive strength of the mudstone in the saturat⁃ed state is obviously reduced with obvious softening effect,and the bearing capacity of the foundation after softening cannot meet the design requirements.In view of this,the water flows in different paths are classified and collected to reduce their deterioration effect on the surrounding rocks during the construction.The measures such as backfilling of the base with gravels and grouting reinforcement can solve the problems of seepage channel and surrounding rocks softening due to excavation disturbance of inverted arch,and the problem of insufficient bearing capacity of foundation is also effectively solved through the grouting reinforcement in the later period.Moreover,the indepen⁃dent vertical and horizontal drainage systems are added in the water-rich sections,so that the water accumulated in the base of the inverted arch can be drained in time when the pressure condition is met,thus avoiding the possible basement diseases caused by bedrock softening due to the effect of groundwater after operation.

关 键 词：铁路隧道 第三系泥岩 工程特性 基底结构 注浆加固 独立排水 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]